ASUS said they're not experiencing many problems unless LAN drivers are used with video-drivers from ATI-AMD, nVidia or Intel (!! - I'm trying to recall how many Matrox and Princeton Graphics cards I've seen for sale in the last few months), and sometimes it's the HD-Audio drivers that create the intermittent conflicts. "It's only when they're activated," is one service-announcement.
I think it was Win 3.1 that delivered the drivers that abrogated HP LaserJets, and it was Win 3.11 that Microsoft delivered shortly thereafter to re-fix that. HP was given some driver instructions, and supposedly Microsoft included the wrong file-set to the RTM diskette-makers. Unfortunately, since printer-drivers also included WYSIWYG font-and-display commands, it was kind of a big deal. And since LaserJets were about 90% of the printer market...
MSI's drivers seem to be dated Nov 14, 2013 at this point, which is fairly quick delivery (a one-month anniv of Win 8.1's retail release, then to hear about problems, then to discern they truly are problems, then to fix and test them - one month is pretty good. Hmmm - wonder if they had a head-start?)
The most telling sign is that every motherboard model I've traced has a separate driver-set for Win 8.1.
I can't remember the last time I've seen a Dot-Release or SP-Release that required new driver-sets. I wonder if there will be a unification set that will eventually be listed as "Win8.x"?